California Code, Insurance Code - INS § 10123.1935

(a) Notwithstanding any other law, a group or individual health insurer offering an outpatient prescription drug benefit shall provide coverage for at least one medication approved by the United States Food and Drug Administration in each of the following categories without prior authorization, step therapy, or utilization review:

(b) This section does not prohibit a health insurer from selecting an AB-rated generic equivalent, biosimilar, as defined in Section 262(i)(2) of Title 42 of the United States Code, or interchangeable biological product, as defined in Section 262(i)(3) of Title 42 of the United States Code, to meet the requirements of subdivision (a).